Explanation: To obtain more than one voltage value from a fixed DC source, both methods are viable. A **resistance-type voltage divider** uses series-connected resistors across the DC source. According to Ohm's Law and Kirchhoff's Voltage Law, each resistor will drop a specific amount of voltage proportional to its resistance value. By tapping connections at different points along the series chain of resistors, multiple, lower voltage outputs can be obtained, though these outputs are not regulated and will vary with load changes. **Voltage regulator tubes** (which can refer to gas-discharge tubes or, more broadly, solid-state equivalents like Zener diodes) are designed to maintain a constant voltage drop across them despite variations in current. By connecting these devices in series or in conjunction with resistors, you can establish stable, regulated voltage points that can be tapped off. For instance, multiple Zener diodes in series could provide different regulated voltage taps. Since both methods allow for deriving multiple voltage values from a single DC source, "Both A & B" is the correct answer.